Three Polish mathematicians are the first to crack the sophisticated Enigma code used by the Germans just before the Second World War. They build replicas of the Enigma machines and manage to get two of the machines to the British and French code-breakers before the German invasion of Poland in 1939; they ask that recognition be given to their work at the end of the war. After the invasion, the Polish cipher bureau escapes and continues their decoding in Algeria and unoccupied France.
The year 1943. The Second World War is on. A group of partisans, which includes, among others, the young poet Gonczar, his friend Włodek and Zosia, are ordered to blow up a railway bridge during a military transport crossing. The task is completed, but with great losses.
An old farmer comes into conflict with his daughter and son-in-law, who value the teaching profession more than farming.
